Can't get debugging breakpoint in the right frame

I’d like to interactively inspect the value of large struct at a certain point in the execution of my program. I am able to use JuliaInterpreter.jl to set a breakpoint, but it seems to be returning the wrong frame.

This minimal example where I’d like to inspect the value of b but am only able to do so for a demonstrates the issue:

julia> function f(x)
        a = x*rand()
f (generic function with 1 method)

julia> function g(y)
        b = y*rand()
g (generic function with 1 method)

julia> r = @interpret f(0.3)
(Frame for f(x) in Main at REPL[36]:1
  1 2  1 ─ %1 = (rand)()
  2 2  │        a = (*)(x, %1)
  3 3  │   %3 = (g)(a)
  4 3  └──      return %3
x = 0.3
a = 0.0508096
callee: g(y) in Main at REPL[37]:1, breakpoint(g(y) in Main at REPL[37]:1, line 3))

julia> JuliaInterpreter.eval_code(r[1], "b")
ERROR: UndefVarError: b not defined
 [1] top-level scope at none:1
 [2] eval at ./boot.jl:331 [inlined]
 [3] eval_code(::Frame, ::Expr) at /home/me/.julia/packages/JuliaInterpreter/owKmt/src/utils.jl:525
 [4] eval_code(::Frame, ::String) at /home/me/.julia/packages/JuliaInterpreter/owKmt/src/utils.jl:502
 [5] top-level scope at REPL[39]:1

julia> JuliaInterpreter.eval_code(r[1], "a")